Which of the following statement is/are incorrect?
- Primary cells are single-use or non-rechargeable batteries.
- Primary cells have low energy density and are made of molten salts and wet cells.
- emf (ε) is the potential difference between the positive and negative electrodes in a closed circuit.
- The electromotive force (emf) of the cell is a type of force.
1
1 and 2 only
2
1, 2, 3 only
3
2, 3 and 4 only.
4
4 only.